Gymnosperms and angiosperms evolved ____ allowing them to live and reproduce in drier habitats than bryophytes and seedless vascular plants.
A. spores
B. seeds, spores, and fronds
C. vascular tissue, spores, and fronds
D. pollen grains and seeds
E. fruit and flowers
Answer: D. pollen grains and seeds
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Cancer causing genes found in some viruses are called:
A. oncogenes. B. proto-oncogenes. C. tumor suppressor genes. D. viral genes.
Mendel knew very little about genetics and nothing about genes or chromosomes. However, his law of independent assortment explains a fundamental phenomenon of genetics. What is that phenomenon?
a. formation of the cleavage furrow and separation of the two progeny in telophase b. crossing over during gametogenesis c. random sorting of the homologous chromosomes during metaphase I d. fertilization and formation of the zygote during sexual reproduction
Why is a species that has few individuals at greater risk of extinction than a species with a large population size?
A) A species with few individuals is more likely to be eliminated by a reduction in population size caused by a chance environmental event like bad weather or a fire. B) There's no risk to a small population as long as genetic diversity is high. C) A species with few individuals is likely to have a high percentage of heterozygotes. This can reduce the likelihood that the species can adaptively evolve in response to environmental changes. D) Genetic drift allows small populations to avoid the loss of advantageous alleles from the population.
Ecologists today largely subscribe to the concept of the climax as a closed system, as espoused by F. E. Clements.
a. true b. false